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(2/5)*(3*x+1) = 3*(3-(2*x))+13 // - 3*(3-(2*x))+13
(2/5)*(3*x+1)-(3*(3-(2*x)))-13 = 0
(2/5)*(3*x+1)-3*(3-2*x)-13 = 0
2/5*(3*x+1)-3*(3-2*x)-13 = 0
2/5*(3*x+1)-3*(3-2*x)-13 = 0
36/5*x-13-43/5 = 0
36/5*x-108/5 = 0
36/5*x-108/5 = 0
36/5*x-108/5 = 0 // + 108/5
36/5*x = 108/5 // : 36/5
x = 108/5/36/5
x = 3
x = 3
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